package com.blogs.common.utils;

import org.apache.commons.lang3.StringUtils;

import javax.servlet.http.HttpServletRequest;

/**
 * ip工具类
 */
public class IPKit {

    /**
     * 获取请求IP地址
     *
     * @param request
     * @return
     */
    public static String getIpAddressByRequest(HttpServletRequest request) {
        String ip = request.getHeader( "x-forwarded-for" );
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase( ip )) {
            ip = request.getHeader( "Proxy-Client-IP" );
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase( ip )) {
            ip = request.getHeader( "WL-Proxy-Client-IP" );
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase( ip )) {
            ip = request.getRemoteAddr();
        }
        return ip;
    }

    public static String getIpAddressByRequest1(HttpServletRequest request) {
        String ip = request.getHeader( "X-Forwarded-For" );
        if (StringUtils.isNotEmpty( ip ) && !"unKnown".equalsIgnoreCase( ip )) {
            //多次反向代理后会有多个ip值，第一个ip才是真实ip
            int index = ip.indexOf( "," );
            if (index != -1) {
                return ip.substring( 0, index );
            } else {
                return ip;
            }
        }

        ip = request.getHeader( "X-Real-IP" );
        if (StringUtils.isNotEmpty( ip ) && !"unKnown".equalsIgnoreCase( ip )) {
            return ip;
        }
        return request.getRemoteAddr();
    }

}
